Why java is called java2

why java is called java2 and another thing that i would like to know is why it was renamed to java from its previous name OAK
Thanx
Manish

why java is called java2Not to sure about this one, but I think it was a marketing decision - I guess 'Welcome to the Java 2 platform' sounds better than saying 'Welcome to the JDK 1.2.1 platform' :=)
and another thing that i
would like to know is why it was renamed to java from
its previous name OAKThere was already a patented product named 'OAK', so they had to rename it to something else to avoid the law.
>
Thanx
ManishA brief history of Java:
http://java.sun.com/features/1998/05/birthday.html
http://www.ils.unc.edu/blaze/java/javahist.html

Similar Messages

Why java is called as true object oriented language?

HI Friends,
Though few oops concepts is not supported , why java is called as truly object oriented language and C++ as not a purely object oriented language???? Please, if any one know , give me the answer.
Thanks to all.

few oops concepts is not supportedwhich concepts?
as far as i know...to be OO, you must supports
encapsulation, abstraction, inheritancxe, composition (aggretration, et all) and polymorphism. Java supports all those comcept..now..Java is a hybrid due to what Jverd has pointed out.
the only pure OO language that i know of is SmallTalk. they have Meta class that can create Class object. and all their primitaives are object.
C# comes close, but their Class are not object.

Why java is called platform independent

Hello
Why java is called as platform independent?Any body please give a detailed explanation since im a beginner to java technology.
ThankYou
Jk

BigDaddyLoveHandles wrote:
georgemc wrote:
SunFred wrote:
Java is not platform independent since it depends on the Java platform ;)Don't complicate matters!I always thought the phrase should have been "platform agnostic"It's a phrase I've used meself

Why java is called pure object oriented.

i know that java is called as pure object oriented language.
why it is called so even though it has primitive datatypes and also it doesnot support multiple inheritance completely. it only supports in the case of interfaces but not in the case of classes. then why it is called pure object oriented.

Its because you cannot write an executable java program without creating an object. Well, you can:
public class a
public static void main( String a[] )
}In contrary to C++, there can be no variables or functions in the wild (outside a class).
You can not create an executable java program without creating a class (but not forcibly its instance, an object.)
The "pure object oriented" wording in this sense has not really much importance, it is rather a marketing ploy.

Why java is called platform independent? "write once, run anywhere" code...

I do have a answer for this. Please shed some light whether i am right or wrong.
When you say java as platform independent, it means that, any java program once compiled to java class can be transferred to anyother machine(say, from windows to unix) can be executed, provided the destination machine has JVM.
where as, in C/C++, if we transfer the object files from one machine to another machine, they will not be executed and they have to be re-compiled in the other machine.
Am i correct?
please, do give me your idea on this...
thanks...

Thanks george !

Why java is platform independent ?

what is the meaning of java is platform independent ? is it just because of java code can be run in windows/linux/unix platform ? but then C/C++ also can be run in windows/linux/unix . so why those are not called platform independent ?
why java is called platform independent ?

c/c++ creates object code . similary java creates bytecode . java uses interpreter JVM to execute . similary c/c++ object code also executes in any platform. so where is the real difference ?
the classes do not need to be recompiled for different platforms. what do u mean by this ? ".....classes ( i.e bytecode) dont need recompilation ..." .....ok....but same thing is true for C/C++ object code also !! they also dont need recompilation.
where is the difference ?

Why cant I call a getResultSet method more than 1

Why cant I call the getRSS method more than 1 time from my page?
I have a class called methods class, here is the code:
public class methodsClass {
    public java.sql.Connection objConn = null;
    public String query = null;
    public java.sql.PreparedStatement statement = null;
    public java.sql.ResultSet objRS = null;
    /** Creates a new instance of methodsClass */
    public methodsClass() {}
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            objConn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:CCD","system", "Abcd1234");
            statement = objConn.prepareStatement(strSQL,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
            objRS = statement.executeQuery();
        catch (Exception e)
            System.err.println("Error in getRSS method");
            e.printStackTrace();
        return objRS;
    public void killConn()
        try
                objRS.close();
                System.out.println("Resultset is closed");
                statement.close();
                System.out.println("Statement is closed");
                objConn.close();
                System.out.println("Connection is closed");
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            System.err.print("Unable to kill all objects");
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//END OF CLASS***************************************** I call the method from the following jsp:
<%
String eqCat = "Tracked Vehicle";
String strSQL = "SELECT DISTINCT * FROM robert WHERE eqcategory = '"+eqCat+"'";
methodsClass mc = new methodsClass();
ResultSet objRS = mc.getRSS(strSQL);
java.lang.System.out.println(strSQL);
%>
     <select name="selectBox">
     <% while(objRS.next()){
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%> The above works fine.
If I try to call the getRSS function again on this page I get the following error:javax.servlet.ServletException: Exhausted Resultset
I tried to call it like so:
newNameSQL = "Select * from robert where eqtypes = 'someVariable'";
newNameRS = mc.getRSS(strSQL);
<%=newNameRSS.getString("something");%>I cant understand why I get this error, I am closing the rs,conn and statement in the killConn method.
TIA!

I did that but still the same error. The problem is when I attempt to open up another resultset on the same page I get the Exhausted ResultSet error. I have even eliminated the class file altogether by doing this:
String eqCat = "Tracked Vehicle";
String strSQL = "SELECT DISTINCT eqtype FROM robert WHERE eqcategory = '"+eqCat+"'";
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection objConn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:CCD","system", "Abcd1234");
PreparedStatement statement = objConn.prepareStatement(strSQL,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet objRS = statement.executeQuery();
System.out.println(strSQL);
//The above works fine and then below I add this and the error comes back
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objRS.close();
objConn.close();
statement = null;
strSQL = null;
strSQL = "SELECT * FROM robert";
Class.forName("oracle.jdbc.driver.OracleDriver");
objConn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:CCD","system", "Abcd1234");
statement = objConn.prepareStatement(strSQL,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet rs = statement.executeQuery();
System.out.println(strSQL);
//If I leave the field below commented out I get no errors, but if I comment it out I get the error
<a href="#" onmouseover="showImg('<%=rs.getString("img1")%>')">

Java function call from Trigger in Oracle

Moderator edit:
This post was branched from an eleven-year-old long dead thread
Java function call from Trigger in Oracle
@ user 861498,
For the future, if a forum discussion is more than (let's say) a month old, NEVER resurrect it to append your new issue. Always start a new thread. Feel free to include a link to that old discussion if you think it might be relevant.
Also, ALWAYS use code tags as is described in the forum FAQ that is linked at the upper corner of e\very page. Your formulae will be so very much more readable.
{end of edit, what follows is their posting}
I am attempting to do a similar function, however everything is loaded, written, compiled and resolved correct, however, nothing is happening. No errors or anything. Would I have a permission issue or something?
My code is the following, (the last four lines of java code is meant to do activate a particular badge which will later be dynamic)
Trigger:
CREATE OR REPLACE PROCEDURE java_contact_t4 (member_id_in NUMBER)
IS LANGUAGE JAVA
NAME 'ThrowAnError.contactTrigger(java.lang.Integer)';
Java:
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "ThrowAnError" AS
// Required class libraries.
import java.sql.*;
import oracle.jdbc.driver.*;
import com.ekahau.common.sdk.*;
import com.ekahau.engine.sdk.*;
// Define class.
public class ThrowAnError {
// Connect and verify new insert would be a duplicate.
public static void contactTrigger(Integer memberID) throws Exception {
String badgeId;
// Create a Java 5 and Oracle 11g connection.
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
// Create a prepared statement that accepts binding a number.
PreparedStatement ps = conn.prepareStatement("SELECT \"Note\" " +
"FROM Users " +
"WHERE \"User\" = ? ");
// Bind the local variable to the statement placeholder.
ps.setInt(1, memberID);
// Execute query and check if there is a second value.
ResultSet rs = ps.executeQuery();
while (rs.next()) {
badgeId = rs.getString("Note");
// Clean up resources.
rs.close();
ps.close();
conn.close();
// davids badge is 105463705637
EConnection mEngineConnection = new econnection("10.25.10.5",8550);
mEngineConnection.setUserCredentials("choff", "badge00");
mEngineConnection.call("/epe/cfg/tagcommandadd?tagid=105463705637&cmd=mmt%203");
mEngineConnection.call("/epe/msg/tagsendmsg?tagid=105463705637&messagetype=instant&message=Hello%20World%20from%20Axium-Oracle");
Edited by: rukbat on May 31, 2011 1:12 PM

To followup on the posting:
Okay, being a oracle noob, I didn't know I needed to tell anything to get the java error messages out to the console
Having figured that out on my own, I minified my code to just run the one line of code:
// Required class libraries.
import java.sql.*;
import oracle.jdbc.driver.*;
import com.ekahau.common.sdk.*;
import com.ekahau.engine.sdk.*;
// Define class.
public class ThrowAnError {
     public static void testEkahau(Integer memberID) throws Exception {
     try {
          EConnection mEngineConnection = new EConnection("10.25.10.5",8550);
     } catch (Throwable e) {
          System.out.println("got an error");
          e.printStackTrace();
}So, after the following:
SQL> {as sysdba on another command prompt} exec dbms_java.grant_permission('AXIUM',"SYS:java.util.PropertyPermission','javax.security.auth.usersubjectCredsOnly','write');
and the following as the user
SQL> set serveroutput on
SQL> exec dbms_java.set_output(10000);
I run the procedure and receive the following message.
SQL> call java_contact_t4(801);
got an error
java.lang.NoClassDefFoundError
     at ThrowAnError.testEkahau(ThrowAnError:13)
Call completed.
NoClassDefFoundError tells me that it can't find the jar file to run my call to EConnection.
Now, I've notice when I loaded the sdk jar file, it skipped some classes it contained:
c:\Users\me\Documents>loadjava -r -f -v -r "axium/-----@axaxiumtrain" ekahau-engine-sdk.jar
arguments: '-u' 'axium/***@axaxiumtrain' '-r' '-f' '-v' 'ekahau-engine-sdk.jar'
creating : resource META-INF/MANIFEST.MF
loading : resource META-INF/MANIFEST.MF
creating : class com/ekahau/common/sdk/EConnection
loading : class com/ekahau/common/sdk/EConnection
creating : class com/ekahau/common/sdk/EErrorCodes
loading : class com/ekahau/common/sdk/EErrorCodes
skipping : resource META-INF/MANIFEST.MF
resolving: class com/ekahau/common/sdk/EConnection
skipping : class com/ekahau/common/sdk/EErrorCodes
skipping : class com/ekahau/common/sdk/EException
skipping : class com/ekahau/common/sdk/EMsg$EMSGIterator
skipping : class com/ekahau/common/sdk/EMsg
skipping : class com/ekahau/common/sdk/EMsgEncoder
skipping : class com/ekahau/common/sdk/EMsgKeyValueParser
skipping : class com/ekahau/common/sdk/EMsgProperty
resolving: class com/ekahau/engine/sdk/impl/LocationImpl
skipping : class com/ekahau/engine/sdk/status/IStatusListener
skipping : class com/ekahau/engine/sdk/status/StatusChangeEntry
Classes Loaded: 114
Resources Loaded: 1
Sources Loaded: 0
Published Interfaces: 0
Classes generated: 0
Classes skipped: 0
Synonyms Created: 0
Errors: 0
.... with no explanation.
Can anyone tell me why it would skip resolving a class? Especially after I use the -r flag to have loadjava resolve it upon loading.
How do i get it to resolve the entire jar file?
Edited by: themadprogrammer on Aug 5, 2011 7:15 AM
Edited by: themadprogrammer on Aug 5, 2011 7:21 AM
Edited by: themadprogrammer on Aug 5, 2011 7:22 AM
Edited by: themadprogrammer on Aug 5, 2011 7:23 AM
Edited by: themadprogrammer on Aug 5, 2011 7:26 AM

Java Applet call javascript problem

Hi I have a web page as follow and embedded a applet. The applet call the java script, and instead of showing an alarm, the browser show the javascript code. Is that strange ? Any suggestion for this problem.
HTML:
================================================================
<HTML>
     <HEAD>
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     </BODY>
</HTML>MyApplet.java
=========================================================================
import netscape.javascript.*;
public class MyApplet extends javax.swing.JApplet
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     private JSObject getJSWin()
          if (m_win == null)
               m_win = netscape.javascript.JSObject.getWindow(this);
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}The page was load and it should call the applet MyApplet. The MyApplet should do the init() method and call the Javascript "ShowEmbd()", BUT, instead of show alert from ShowEmbd(), the browser show the code of ShowEmbd() itself ...... It did not run the javascript and shows the alert ??
The browser shows a message from status bar "The applet not initial" ???? why ???
Can anyone help ?!

On first look:
I am not sure about the Object Tag, but the Applet Tag requires the MAYSCRIPT attribute before Java can call Javascript.

Why fail to call third party funciton in DLL via JNI but workable in C++?

Hi,
I need someone help me here.
I like to call a function in third party A.dll which is from PowerBuilder App by Java.
So first I worte C++ code to call A.dll for the function to confirm: String feGetMM( String a);
I worte code like here in C++:
typedef char * (CALLBACK PROC_ADDR) ( const char);
const char* NAME = "feGetMM";
PROC_ADDR procAddr;
const char* passin = "123";
char * result;
HINSTANCE hinstLib = LoadLibrary( A.dll ); //load 3rd party library
if(hinstLib!=NULL) {
     //get the function address
     procAddr = (PROC_ADDR) GetProcAddress(hinstLib,NAME);
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I got right result.<<<<<<<<<<<<<Then second I worte the same as C++ in JNI code to generate B.dll
JNIEXPORT jint JNICALL Java_xxxxx_feGetMM
(JNIEnv *env, jclass cl, jstring jstr) {
typedef char* (CALLBACK PROC_ADDR) ( const char);
const char* NAME = "feGetMM";
PROC_ADDR procAddr;
const char* result;
HINSTANCE hinstLib = LoadLibrary( A.dll ); //load 3rd party library
if(hinstLib!=NULL) {
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const char* cstr = env->GetStringUTFChars(jstr,NULL);
     if(procAddr!=NULL)
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fails return NULL<<<<<<<<*the B.dll builded successfully, but fail to call for result. The java main() call is fine. The "result" is always NULL.
I worte the same as C++ code in JNI but why it fails in JNI code call by Java?
I will appreciate your help if you could reply it quickly.
Thanks !

The crashdump fragment tells me that your program has jumped to location 0. That's usually an uninitialized pointer

Using java to call a text file

I am new to java and was wondering if there is a way of using java to call a text file on my server and use it to create a webpage using a template. Namely to click a link to a poem, and have the java automatically create a page from a text file of the poetry. I need to know if this is even possible, what I would need to look into, (IE: which software or applet to look for), and if there are any sites that anyone knows about that I could learn how to do this. currently I am having to create a page for every poem posted on my site, which takes a great deal of time, and I would like to speed the process up a bit if it is possible. Any suggestions would be greatly appreciated.

Why a text file? I don't think it is a best practice of doing that. Just use a database, keep your poem collections there, and set up a jsp page that seek the database, and then display it on another jsp page. I guess you can find similar application in the sample projects provided by JSC.

Why JNDI is called an Interface?

Why JNDI is called as Java Naming and Directory Interface, question is why
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It is an interface because it is defined as an abstract set of APIs, not actually implementation. The actually implementation is done by service providers.
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Hope this helps.

Why java allow start() method only once for a thread

Hi ,
Why java allows start method only once for thread . suppose
Thread t = new Thread();
t.start();
say at later stage if again we call t.start() IllegalStateException is thrown , even though isAlive method returns false.
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Really. Why do you think that? Do you have any evidence? It is one of the first things I would think of, personally.Considering that the Thread API doesn't allow you to specify a stack address (only stack size), I think it demonstrates they wanted to remove that capability from their Thread API all together. That missing "capability" makes me believe they want me to believe it's not something I need to worry about when using their API... I think the exact semantics of the Thread class and its methods were driven by how to make it most understandable and usable for their customers. I'm certain this issue was one of many that was given considerable thought during the design and implementation of the JVM and the underlying runtime classes.
Do I have any evidence? No. But if you can point me at some first-hand information on this, I'd love to read it. Most of what I've found is second or third hand accounts. (and I mean that sincerely, not as a smart-ass remark or rebuke of your comments).
On the one hand you seem to think the Java API designers are idiots, on the other hand you think that they should be. I can't make it out.I thought my position was that the Java developers were talented enough to implement platform in whatever way their API called for; hence, the designers made a choice about how they wanted their API to be used by their customers. They decided which capabilities they wanted to include or exclude, and created an API that was consistent with their vision for this technology. While I'm certain technical limitations had an effect on the API design, I certainly don't think the API was dictated by the them.
I think the current design of the Java Thread API was a reflection of their vision to make Threading easier and more accessible to Joe Programmer, not limitations in the implementation. I never said it was wrong or that I could do better... I just said I think they could have done something different if they decided it would have made for a better customer experience. But hey, maybe I'm wrong.

Why JVM is called a machine??????

Hello All,
i want to know why JVM is called a machine.
does it have a memory or processor in it,thats why
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-thanks in advance
upasna

to be exact a java virtual machine, think of it this way, currently right now your machine thinks in "native code" aka binary, this is a "hardware" version of all software on your machine, most software is in "binary" format, next you have the java virtual machine which thinks in "bytecode" format, the virtual machine does not have a "hardware" version built onto your PC, so Sun had to make their own "software" version that converts "bytecode" into binary, this is why it is called a virtual machine because it sits on all operating systems and does this conversion so since it is not hardware, aka a "real" chip that does this conversion, it is "virtual" or software...

Why Java is Technology?

Hello everyone,
I m very new to java, i m still learning java. At the beginning itself i got a doubt that why everyone calls java as a technology not language. Please let me know why is Java is called as technology not Programming language.

All that is true, but the word "technology" gets overused.
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http://java.sun.com/developer/technicalArticles/J2EE/intro_ee5/
I searched and found these uses of the word technology. How many uses
actually add meaning to the sentences in which they appear?
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As the standard API used to bind XML documents to Java technology objects,
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Example 9 shows a Java technology class annotated for use with JAXB 2.0.
A common issue in developing some Java technology classes first and defining their mapping to Schema later is that some common Java technology types do not have a standard representation in XML Schema.
The JavaServer Faces technology establishes standards for component design and as a result has created a new market for third-party JavaServer Faces technology components.
One or more JSP technology pages
Duke, the Java technology mascot [oy!]

Why java is called java2

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